Klopp singled out Sahin for praise, describing the midfielder's 30-yard strike as a "world-class goal", and also gave credit to the whole team for their performance.
"I am very satisfied with the win. From the 10th minute we played a good game with Nuri scoring a world-class goal, though in the second we allowed the opponent too much and they came out and did well," the 45-year-old coach told reporters.
"But from my point of view it was not serious as it is normal that we can lose a little bit of the concentration.
"We are certainly not undeserved winners, just that due to their late goal it was a little lucky."
Dortmund are second in the Bundesliga behind newly-crowned champions Bayern Munich.